Semsri, Aphichit. 2022. “Determination of Optimum Temperature of Barrel Heater forReducing Waste in Plastic Injection Molding Process of Tractor Turn Signal Cover Parts using DMAIC Techniques”. Engineering and Technology Horizons 39 (3):111-30. https://ph01.tci-thaijo.org/index.php/lej/article/view/248112.